Unit 2 (Homeostasis)

Question 1

What is the definition of homeostasis?

Answer 1

It maintains constant internal environment (Equilibrium/balance) in response to stress. AND/OR It is the ability to adjust cellular and physiological processes to maintain internal balance

Question 2

What is stress?

Answer 2

Anything that disrupt homeostasis (Internal balance).

Question 3

What are the 3 types of stress?

Answer 3

Environmental, Physical, Emotional

Question 4

What are the 4 steps of homeostasis?

Answer 4

1. Variable (Can be modified) ex.: Body temperature
2. Receptor (Detect the change) ex.:Thermoreceptor
3. Integrator/Control Center (Interpretation of info) ex.: Brain (CNS)
4. Effectors (Response, acts on variable to bring values back to normal) ex.: Muscles and glands.

Question 5

What are the 2 systems involved in the control?

Answer 5

Nervous and Endocrine System

Question 6

What are two differences between the nervous and the endorcine system?

Answer 6

The nervous system sends quick nerve impulses while the endocrine system sends slow messages through hormones. AND the nervous system has a really shrt duration while the effects of hormones have a longer duration.

Question 7

What is a negative feedback loop?

Answer 7

SYstems in which, by their response to the stimulus, put an end to the initial stimulus or at least reduce it.

Question 8

What is a positive feedback loop?

Answer 8

It strenghtens or reinforces the initial stimulus. They do not happen often, since they can be life threatening for the body. Ex.: Blood clotting, ovulation, childbirth.